html,
body,
div,
header,
footer,
section,
nav,
aside,
article,
ul,
ol,
li,
dl,
dt,
dd,
h1,
h2,
h3,
h4,
h5,
h6,
p,
table,
form {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    user-select: none;
}

input,
textarea {
    border: 0;
    outline: none;
}

input,
button {
    box-sizing: border-box;
}

button,
select {
    background-color: transparent;
    border: 0;
}

a,
a:link,
a:visited,
a:active,
a:focus {
    color: #000;
    text-decoration: none;
}

img {
    vertical-align: middle;
}

ul,
ol {
    list-style: none;
}

.fl {
    float: left;
}

.fr {
    float: right;
}

.clearfix::after {
    content: "";
    display: block;
    clear: both;
}